Gen7 20Mhz Crystals Capacitors January 09, 2013 09:56AM |
Registered: 11 years ago Posts: 11 |
Re: Gen7 20Mhz Crystals Capacitors January 10, 2013 09:12AM |
Registered: 13 years ago Posts: 7,616 |
Quote
the capacitors used for the crystal don't match what the crystal says should be used.
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Re: Gen7 20Mhz Crystals Capacitors January 11, 2013 09:07AM |
Admin Registered: 17 years ago Posts: 7,879 |
Re: Gen7 20Mhz Crystals Capacitors January 12, 2013 08:59AM |
Registered: 13 years ago Posts: 7,616 |
Quote
If you don't match the load capacitance of the crystal it gives slightly the wrong frequency as the frequency stated is at the recommended load capacitance.
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Re: Gen7 20Mhz Crystals Capacitors January 12, 2013 12:18PM |
Admin Registered: 17 years ago Posts: 7,879 |
Re: Gen7 20Mhz Crystals Capacitors January 12, 2013 03:23PM |
Registered: 11 years ago Posts: 42 |
Re: Gen7 20Mhz Crystals Capacitors January 12, 2013 04:59PM |
Admin Registered: 17 years ago Posts: 7,879 |
Re: Gen7 20Mhz Crystals Capacitors January 12, 2013 05:32PM |
Registered: 11 years ago Posts: 42 |
Re: Gen7 20Mhz Crystals Capacitors January 12, 2013 08:12PM |
Admin Registered: 17 years ago Posts: 7,879 |
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I would rely on the data sheet in this case - because they are proven to work.
Re: Gen7 20Mhz Crystals Capacitors January 12, 2013 09:08PM |
Registered: 12 years ago Posts: 1,236 |
Re: Gen7 20Mhz Crystals Capacitors January 12, 2013 10:41PM |
Registered: 11 years ago Posts: 11 |
Re: Gen7 20Mhz Crystals Capacitors January 13, 2013 05:01AM |
Registered: 11 years ago Posts: 42 |
Re: Gen7 20Mhz Crystals Capacitors January 13, 2013 10:09AM |
Registered: 13 years ago Posts: 7,616 |
Quote
ItsDrone
The idea was to link them via 3 wire spi and buffer between them with 512kb sram.
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z0ttel
On the AT90 side, this would mean a clock of max 4MHz, so your 644P's SPI clock must be configured to fosc/8, because fosc/4 would still be too high.
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Re: Gen7 20Mhz Crystals Capacitors January 13, 2013 01:56PM |
Registered: 11 years ago Posts: 11 |
Re: Gen7 20Mhz Crystals Capacitors January 15, 2013 05:36PM |
Registered: 12 years ago Posts: 1,236 |
Re: Gen7 20Mhz Crystals Capacitors May 21, 2013 01:19AM |